FaceTime Incoming Audio Distorts, Then Drops Altogether

After several minutes of conversation, my FaceTime correspondent’s voice starts coming in gravelly, then her incoming audio stops altogether. Her incoming video remains fine, as does my outgoing voice/video to her.

She reports that her FacetTme connections with other correspondents are trouble free, and there’s no such problem when I reestablish communication with her using Skype, so the fault is evidently with my FacetTme app. (Shouldn’t be corrupt; I recently did a clean install.)

I’m guessing a cache somewhere fills up. Whatever .... What can I do about it?